In the Zona Franca de Barcelona building rental apartments for young people whose vital center a diagonal sequence of open spaces sponge volume built by integrating, through terraces and covered patios, the powerful environment Montjuic mountain. The most demanding systems incorporate sustainability, both constructive energy and environmental perspective. The proper orientation and the system of adjustable vertical slats on the large windows of the facades, ensure maximum sunlight in winter and maximum sun protection in summer, resulting in significant energy savings. An innovative energy saving system has been put in work, is a model of micro gas boiler DHW heating and electricity. On the other hand, has initiated research project (ongoing) of an innovative system for collecting thermal and photovoltaic solar energy. The Sunflower Lama project is a system that integrates architecture renewables, bringing them to the user to make co-responsible for environmental conservation.